My approach to creating this topic was to gather experiences on whether you always have to completely renovate old houses (with renovation backlog) on a property!
So, do the roof, pipes, windows, and electrical systems always have to be new because they are so old?
You don’t have to do anything at all. You can probably live in it normally—like the previous occupant did in recent years. You WANT to renovate, but you don’t have to. However, living comfort in the 1950s was quite different from today (minimal electrical installations, no network at all, radiators heated with oil and thus with today’s oil prices rather €3,000+ in heating costs, drafty and poorly insulated windows, etc.).
You only have to do what the Building Energy Act requires of you (possibly insulating the upper floor ceiling or roof and insulating pipes).